Synthetic paper is a new type of paper that replaces plant fibers with high molecular compounds. It has excellent environmental performance, physical and chemical properties and printing performance. It is widely used in commercial, packaging, construction and other fields, such as making water-resistant newspapers and light-weight bags/ Boxes, labels , architectural wallpapers, etc. This paper analyzes the common problems of synthetic paper printing, and studies the printing color gamut, printing gloss and abrasion resistance of synthetic paper, and obtains some necessary data about the suitability of synthetic paper printing. Provides some useful references for prepress image linearization and print process control.
Synthetic paper printing FAQ
1. Long drying time
Synthetic paper has the characteristics of plastic and has poor surface water absorption and oil absorption. Therefore, the requirements for water and ink are different from ordinary paper, and the drying time required for synthetic paper printing is longer than that of ordinary fiber paper, and the printing process is liable to cause smudging.
2. Easy to generate static electricity
Compared with ordinary paper, synthetic paper is prone to static electricity, and most of the problems encountered by printing companies in folding synthetic paper are caused by static electricity. Static electricity not only increases friction but also reduces product humidity.
3. Folding is easy to produce creases
Compared with ordinary paper, synthetic paper has no texture structure, and because of its plastic characteristics, it is easy to produce rebound, so it is easy to cause creases due to uneven lines when folding.
Synthetic paper printing suitability test
1. Printing equipment and equipment
The paper used in the experiment is Taiwan South Asia PP synthetic paper (imitation high-grade coated paper), the ink is DIC standard four-color offset printing ink, and other consumables are Vigra ink quick-drying agent and varnish. The experimental model is IGT printing suitability instrument, the printing model is KBA Rapida 105-5, and the spectrophotometer is X-Rite eXact.
2. Experimental methods
This experiment uses three printing methods, as follows.
(1) Synthetic paper color of seven colors (R, G, B), double overprint (C, M, Y) and solid color (K) exhibited in the laboratory by IGT printing suitability tester article. No water was involved during the test. After drying, the drying time of the color strips was recorded, and the L*a*b* values ​​of the seven colors were measured. The printing pressure of this experiment was set to 625 N, and the printing speed was 0.5 m/s. The layer thickness was 2.4 μm, the experimental ambient temperature was (23 ± 1) ° C, and the humidity was (50 ± 3)%.
(2) The printing machine is normally printed at a speed of 9000 sheets/hour, the time required for complete drying is recorded, and the L*a*b* values ​​of the seven colors of CMYKRGB are measured.
(3) The printing machine normally prints and connects the light at a speed of 9000 sheets/hour. In order to speed up the drying of the ink, 3% of the quick-drying agent is added to the ink to record the time required for complete drying.
Synthetic paper printing test results
Printing drying speed
The drying time of the three printing methods is: laboratory offset ink printing, no water involved in the printing process, the drying time is about 6 hours; in fact, the machine printing, under the ink and water balance conditions, the drying time is about 24 hours; The quick-drying agent is added and light is connected, and the drying time is about 15 hours.
Since the surface characteristics of synthetic paper are different from those of plain paper, early synthetic paper must be printed with a special synthetic paper ink to ensure its normal drying, which will greatly increase the cost of ink. From the results of this experiment, the new synthetic paper has been fully adapted to offset ink printing, but it needs to do the corresponding quick-drying treatment. The commonly used processing methods are as follows.
(1) speed up the dry agent
Adding a quick-drying agent to the ink can increase the drying speed of the ink, but the composition and properties of the fast-drying agent are different, and the influence on the drying performance of the ink is different. At the same time, the amount of quick-drying agent also has a certain influence on the drying speed of the ink. Adding an appropriate amount of quick-drying agent can play a role of drying, but if the quick-drying agent is added in excess, the ink will be crystallized.
(2) Connecting light
By connecting the light, the ink drying can be accelerated indirectly, because the varnish is water-based, it will dry quickly through the hot air blowing system, and can cover the ink surface to prevent the ink from being dirty; not only improve the drying speed of the ink on the surface of the synthetic paper. It also improves the gloss of the ink film.
(3) Control the amount of printing water and reduce the degree of ink emulsification
The surface of the synthetic paper is highly resistant to water. If the amount of water on the surface of the printing plate is too large, the ink is easily emulsified, which is not conducive to drying. Therefore, in the case of ensuring that the graphics are not dirty, try to reduce the amount of water.
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